<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品列表</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 消息提示区域 -->
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false"
      >
      </el-alert>

      <!-- 步骤条区域 -->
      <el-steps
        :space="200"
        :active="parseInt(activeIndex)"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tab栏区域 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <el-tabs
          :tab-position="'left'"
          v-model="activeIndex"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"> </el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="cascaderProps"
                @change="handleChange"
                clearable
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染动态参数表单item项 -->
            <el-form-item
              :label="item.attr_name"
              :key="item.attr_id"
              v-for="item in manyTableData"
            >
              <!-- 使用数组渲染复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  :label="cs"
                  border
                  v-for="(cs, index) in item.attr_vals"
                  :key="index"
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <!-- 循环生成静态属性 -->
            <el-form-item
              :label="item.attr_name"
              :key="item.attr_id"
              v-for="item in onlyTableData"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action 表示图片要上传到的后台API地址 -->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品按钮 -->
            <el-button type="primary" class="btnAdd" @click="add"
              >添加商品</el-button
            >
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 预览图片对话框 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt="" class="previewImg" />
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'

export default {
  name: 'Add',
  data() {
    return {
      // 保存步骤条激活项索引
      activeIndex: '0',
      // 添加商品的表单数据
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 上传图片数组
        pics: [],
        // 商品的详情介绍
        goods_introduce: '',
        // 商品的参数
        attrs: [],
      },
      // 添加商品的表单的验证规则
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称！', trigger: 'blur' },
        ],
        goods_price: [
          { required: true, message: '请输入商品价格！', trigger: 'blur' },
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量！', trigger: 'blur' },
        ],
        goods_number: [
          { required: true, message: '请输入商品数量！', trigger: 'blur' },
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类！', trigger: 'blur' },
        ],
      },
      // 商品分类的数据列表
      cateList: [],
      // 指定级联选择器的配置对象
      cascaderProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        expandTrigger: 'hover',
      },
      // 动态参数列表
      manyTableData: [],
      // 静态属性列表
      onlyTableData: [],
      // 上传图片的URL地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传时的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token'),
      },
      // 保存预览图片的url地址
      previewPath: '',
      // 预览图片对话框是否显示
      previewVisible: false,
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        // 提示错误
        return this.$message({
          duration: 2000,
          message: '获取商品分类数据失败！',
          type: 'error',
        })
      }
      // 把数据列表赋值给 cateList
      this.cateList = res.data
    },
    // 级联选择器选中项发生变化时
    handleChange() {
      // 如果选择的不是三级分类,该次选择无效
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    // 切换标签之前的钩子
    beforeTabLeave(activeName, oldActiveName) {
      /*   if (oldActiveName === '0') {
        // 在第一个标签页的时候
        if (this.addForm.goods_cat.length !== 3) {
          this.$message({
            duration: 2000,
            message: '请选择商品的分类！',
            type: 'error',
          })
          return false
        } else if (this.addForm.goods_name.trim() === '') {
          this.$message({
            duration: 2000,
            message: '请输入商品名称！',
            type: 'error',
          })
          return false
        } else if (this.addForm.goods_price === 0) {
          this.$message({
            duration: 2000,
            message: '请输入商品价格！',
            type: 'error',
          })
          return false
        } else if (this.addForm.goods_weight === 0) {
          this.$message({
            duration: 2000,
            message: '请输入商品重量！',
            type: 'error',
          })
          return false
        } else if (this.addForm.goods_number === 0) {
          this.$message({
            duration: 2000,
            message: '请输入商品数量！',
            type: 'error',
          })
          return false
        }
      }
     */
    },
    // 当点击切换tab栏时触发
    async tabClicked() {
      if (this.activeIndex === '1') {
        // 发送请求获取动态参数
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: {
              sel: 'many',
            },
          }
        )
        if (res.meta.status !== 200) {
          return this.$message({
            duration: 2000,
            message: '获取动态参数列表失败！',
            type: 'error',
          })
        }
        // 将attr_vals字符串转换为数组
        res.data.forEach((item) => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        // 发送请求获取静态属性
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: {
              sel: 'only',
            },
          }
        )
        if (res.meta.status !== 200) {
          return this.$message({
            duration: 2000,
            message: '获取静态属性列表失败！',
            type: 'error',
          })
        }
        this.onlyTableData = res.data
      }
    },
    //  处理图片预览效果
    handlePreview(file) {
      // 形参file就是用户预览的那个文件
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove(file) {
      // 形参file就是用户点击删除的文件
      // 获取用户点击删除的那个图片的临时路径
      const filePath = file.response.data.tmp_path
      // 使用findIndex来查找符合条件的索引
      const index = this.addForm.pics.findIndex((item) => item.pic === filePath)
      // 移除索引对应的图片
      this.addForm.pics.splice(index, 1)
    },
    // 监听图片上传成功的事件
    handleSuccess(response) {
      // 形参response就是上传成功之后服务器返回的结果
      // 将服务器返回的临时路径保存到addForm表单的pics数组中
      const picInfo = { pic: response.data.tmp_path }
      this.addForm.pics.push(picInfo)
    },
    // 添加商品
    add() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) {
          return this.$message({
            duration: 2000,
            message: '请填写必要的表单项！',
            type: 'error',
          })
        }
        // 处理动态参数
        this.manyTableData.forEach((item) => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' '),
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(async (item) => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals,
          }
          this.addForm.attrs.push(newInfo)
        })
        // 将addForm进行深拷贝，避免goods_cat数组转换字符串之后导致级联选择器报错
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 发起请求，添加商品
        // 商品的名称必须是唯一的
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) {
          return this.$message({
            duration: 2000,
            message: '添加商品失败！',
            type: 'error',
          })
        }
        this.$message({
          duration: 2000,
          message: '添加商品成功！',
          type: 'success',
        })
        this.$router.push('/goods')
      })
    },
  },
  computed: {
    // 当前选中的三级分类ID
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    },
  },
}
</script>

<style scoped>
.el-cascader {
  width: 260px;
}

.el-checkbox {
  margin: 0 20px 0 0 !important;
}

.previewImg {
  width: 100%;
}

.btnAdd {
  margin-top: 20px;
}
</style>
